I purchased a Biostar eGate GeForce FX5500 AGP video card to use it with my "multimedia PC", wich is an Ubuntu PC connected to my TV, wich supports both NTSC and PAL (usually showing wich format it's receiving with a LED) and works fine with other inputs like VCR.

I set up the twinview in clone mode and worked really fast, but the problem is that image is in black and white.
The TV says that it's not receiving neither PAL or NTSC, and the image is B/W.

I tried SVIDEO to COMPOSITE cable that comes with the card and an SVIDEO-SCART cable with same results.

I also tried to set-up both SVIDEO and COMPOSITE settings, SVIDEO seams to give a better quality but still in B/W.

Obviously I also tried to configure a lot of kinds of PAL and NTSC modes but it seems that it has no effect and image is always identical.
I think the problem is that card is always in NTSC regardless of the setup, but I'm not sure, because NTSC should work fine with this TV.

I attach my nvidia-bug-report.log file, catched with an startx -- -logverbose 5 for more detail.